Kotej
Compare two texts and see every change
Paste two texts, or pick two files, and see what changed: side by side, as a unified diff like GitHub's, or word by word inside each line, the best view for prose and configuration.
Free, no account, and nothing is uploaded: everything is compared in your browser.
What it does
- Three layoutsSide by side, unified, or word by word. Press V to switch; your choice is remembered.
- Paste or pick filesCompare two snippets without saving them, or two files of any size.
- TolerancesOptionally ignore trailing whitespace, all whitespace, case, blank lines or line-ending differences.
- Knows the formatPick an XML, JSON or log file and it is compared by structure instead of by line.
How to use it
- Open Kotej and choose "Compare pasted text", or pick a file for each side.
- The differences appear as you type.
- Switch layouts with V until the change is obvious.
Questions
Can it ignore whitespace?
Yes. Trailing whitespace is ignored by default, and you can also ignore all whitespace, case, blank lines and line endings.
Which layout should I use?
Side by side for comparing structure, unified for reviewing code as on GitHub, and word by word for prose, where a line changes by one or two words.
Are my files uploaded?
No. Kotej runs entirely in your browser: files are read on your device and compared there. Nothing is sent to a server, which is also why it works on confidential configuration, customer data and production logs.
Is it free?
Yes, free and with no account. There is also a native macOS app with the same engine, for comparing folders straight from Finder: Kotej on the Mac App Store.